It's interesting to note that when utilizing ng-if="truthyValue" and data-ng-if="truthyValue" within an HTML element in the context of AngularJS version +1.6, the element in question will not be rendered in the DOM. This holds true even if ng-if and data-ng-if are used with a boolean value of true.
Is there anyone who understands the reasoning behind this phenomenon?
This particular response draws from various excerpts of AngularJS's directive documentation.
The rationale behind this lies in the fact that AngularJS HTML templates go through a process known as compilation:
Within AngularJS, "compilation" refers to the attachment of directives to HTML elements to render them interactive.
During compilation, template directives are subjected to Normalization, which entails converting case-insensitive names in HTML to camelCase format utilized by AngularJS. This involves the following steps:
- Remove
x-anddata-prefixes from element/attribute names.- Transform colon (:), hyphen (-), or underscore (_) delimited names into camelCase.
As a result of this process, instances may arise where two ngIf directives are linked to a single HTML element. In such scenarios, conflicts can occur (it is explained why having two occurrences of ng-if works but not when mixed with data-ng-if - the browser eliminates one directive before reaching the AngularJS compiler).
Therefore, to avoid such complications, the solution is to refrain from using multiple directives in your HTML that AngularJS normalizes to identical formats.
After conducting some tests, it appears that everything is functioning properly with Angular 1.6.5.
It's important to note that using both data-ng-if and ng-if on the same element is not recommended. Stick to using one of them for consistency.
<div ng-app="myApp">
<div ng-controller="MyCtrl">
<div ng-if="false">hello there</div>
<div ng-if="true">whats up</div>
</div>
</div>
var myApp = angular.module('myApp', []);
myApp.controller('MyCtrl', ['$scope', function($scope) {
}]);
You can view a working example on codepen:
https://codepen.io/anon/pen/YxoXgE
This issue isn't exclusive to ng-if but also applies to other Angular directives like ng-repeat. Simply removing one of the declarations will resolve the problem immediately.
Here's an instance where using both ng-repeat and data-ng-repeat doesn't work:
https://codepen.io/anon/pen/KvjdZV
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